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Benzene and its derivatives.

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Concentration

Amount of solute per unit volume or mass of solvent or of solution.

Photochemical Oxidants

Photochemically produced oxidizing agents capable of causing damage to plants and animals.

Solute

The dispersed (dissolved) phase of a solution.

Nuclides

Refers to different atomic forms of all elements in contrast to ?isotopes?, which refer only to different atomic forms of a single element.

Open Sextet

Refers to species that have only six electrons in the highest energy level of the central element (many Lewis acids).

Henry's Law

The pressure of the gas above a solution is proportional to the concentration of the gas in the solution.

Haber Process

A process for the catalyzed industrial production of ammonia from N2 and H2 at high temperature and pressure.

Double Bond

Covalent bond resulting from the sharing of four electrons (two pairs) between two atoms.

Formal Charge

A method of counting electrons in a covalently bonded molecule or ion, counts bonding electrons as though they were equally shared between the two atoms.

Essential Oil

A plant extract that has a distinctive odour or flavour.